package day04;


import java.util.Scanner;

public class SwitchCaseDemo {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();

        switch (n){
            case 1:
                System.out.println("in");
                break;
            case 2:
                System.out.println("out");
                break;
            case 3:
                System.out.println("check");
                break;
            case 4:
                System.out.println("back");
                break;
            default:
                System.out.println("exit");
        }

    }

}
